Cement kiln and feeder control



March 26, 1929. I R. w. RYDER CEMENT KILN AND FEEDER CONTROL vFiled Nov.24, 1925 IRMA runs Ltnos wl nwrn LEA a:

ROBE/PT w RYDER.

Patented Mar. 26, 1929.

UNITED STATES ROBERT W. RYDER, OF SAN FRANCISCO,

CALIFORNIA, ASSIGNOR TO SANTA CRUZ PORTLAND CEMENT COMPANY, OF SANFRANCISCO, CALIFORNIA, A CORPORATION OF CALIFORNIA.

CEMENT KILN .IND FEEDER CONTROL.

Application filed November 24, 1925. Serial No. 71,089.

This invention relates to rotary kilns in general and feeders therefor,and in particular to raw mix feeders in combination with tubular cementcalcining kilns.

The principal objects of the invention are to effect a cooperatingcontrol of feeder speed and kiln rotation providing for relativevariations when desired and all operated from one point, preferably nearthe discharge end of the kiln.

Other objects lie in the arrangements and details of the elementsthrough which the desired control is obtained.

In the drawings herewith an embodiment of my invention is shown, thefigure being a side elevation of the complete installation anddiagrammatic showing of the electrical connections.

The figure shows a tubular rotary cement kiln 1 supported on rollerbearings 2 and driven through means of a ring gear 3 and pinion 3 in theusual way.

At 4 is shown the hopper from the raw mix bin discharging into a feederbox 5 for feeding by means of a spiral conveyor 6 through the dustchamber 7 at the base of the stack 8 and into the kiln 1.

The particular feeder here'shown is more completely described and shownin my Patent No. 1,628,197, granted May 10, 1927, but

its use in the present combination is only illustrative as any type ofpositive feeder may be used with the improved control of which thisapplication treats.

The feeder is operated by a variable speed motor 9 through theintermediary of .a speed or gear reduction 10, and the kiln is similarlyoperated by another variable speed motor 11 through any suitable speedor gear reduction as at 12. v

The power circuits to dicated and the variable speed or armature leadsare shown respectively extended to individual controller boxes 13 and 14situated adjacent the discharge end of the kiln, while the ower leads toeach motor are shown provided with no-voltage or overload cutoutswitches '15 and 16 having a trip connection 17 to insure one switchopening upon the opening of the other, thus if the feeder stops for anycause the kiln will'also stop.

The controller boxes are geared together so that upon operation of. thehand lever 18 on one box both boxes will be operated to these motors areinstart, increase or decrease the speed of both feeder and kiln.

In the drawing the gear connection between the rotating shaft of theboxes is shown as consisting of sprockets 19 and 20 and chain 21, and inthe initial adjusting of the chain and sprockets the relative speed ofthe feeder to the rotations ofthe kiln may be determined either throughthe rotative positions or setting of the sprockets, or their relativesize as it is evident that one may be larger than the other so thateither the feeder or the kiln will increase in speed at adiflerent ratethan the other, tho it is also contemplated that the sprockets beoutermost in their position on the boxes for easy changing from theirshafts to any other size which occasion may require.

In addition to the provision for varying the control relation throughdifferent size sprockets provision is made for bodily r0- tating one ofthe controller boxes on itsaxis so as to advance or retard itselectrical contacts with respect tothe other box.

This is shown in the drawing, box 13 being ri idly secured in placewhile box 14 is rot-ata 1y mounted on its own shaft supported by hearingbrackets at both ends as indicated at one end at 22.

The bearing brackets are fixedly secured in place and the shell of thebox 14 is provided with an arm 23 extending over a quadrant 24 carriedby the brackets and locking by suitable means at various points alongthe quadrant, such for instance as thepin 25 passing through the arminto any of the holes 26 in the quadrant.

Thus the box 14 may be revolved around its shaft to the limit of thequadrant provisions and locked at any point desired.

The operating controller bar or handle 18 while shown on box 13 may ofcourse be on,

either box, and while I show but two controllers geared together in aspecial way it is obvious without further showing that any number ofcontrollers may be so connected andoperated fromv any of them foroperating any numberof feeders and kilns.

I claim:

1. In combination with a revolvable kiln and a material feeder therefor,a variable s eed electric motor arranged to drive the kllll and a secondvariable speed electric motor arranged to drive the feeder, electricalcircuits including a separate controller box for each motor, saidcontroller boxes being equipped with fixed contact parts and movablecontact parts and mechanical means connecting the moving contact partsof the controller boxes to effect simultaneous operation of the same.

2. In combination with a revolvable kiln and a material feeder therefor,a variable speed electric motor arranged to drive the kiln and a secondvariable speed electric motor arranged to drive the feeder, electricalcircuits including a separate control- ,ler box for each motor, saidcontroller boxes being equipped with fixed contact parts and movablecontact parts, mechanical means connecting the moving'contact parts ofthe controller boxes to effect simultaneous operation of the same andmeans for advancing the position of fixed contacts in one box relativeto the fixed contact in otherbox.

3. In combination with a revolvable kiln and a material feeder therefor,a variable speed electric motor arranged to drive the kiln and a secondvariable speed electric motor arranged to drive the feeder, electricalcircuits including a separate controller box for each motor, saidcontroller boxes being equipped with fixed contact parts and movablecontact parts, mechanical means connecting the moving contact parts ofthe controller boxes to effect simultaneous operation of the same, oneof said boxes being bodily mounted for movement of the fixed contactpart relative to its moving counterart.

p 4. In combination with a revolvable kiln and a material feedertherefor, an electric motor arranged for driving the kiln and atrippingmeans provided in 'each switch,

connected by said circuit.

5. In combination with a revolvable kiln and a material feeder therefor,an electric motor arranged for driving the kiln and a second electricmotor arranged for driving the feeder, electrical circuits for themotors including a separate overload cut-out switch for each motor, anelectric circuit from one switch to the other and electrical trippingmeans provided in each'switch, connected by said circuit wherebyone'switch will open upon the opening of the other and separatecontroller boxes for the motors mechanically connected for simultaneousoperation.

a 6. The combination with arevolvable kiln and a material feedertherefor, of an' electric motor arranged for driving the kiln and asecond electric motor arranged for driving the feeder, electric circuitsfor the motors including a separate overload cut-out switch for eachmotor, an electric circuit between the switches to effect simultaneousoperation of the same, and separate controller boxes for the motors,said controller boxes being equipped with fixed contact parts andmovable contact parts, one of said boxes being mounted for bodilymovement of its fixed contact part to advance or retard its posiiton onits movable counterpart and mechanical means connecting the movablecounterparts of said controller boxes.

, ROBERT W. RYDER.

